Flesh out README with Python and JavaScript sections, outlining CLI options and defaults.

README.md

@@ -8,7 +8,11 @@ JavaScript, unpack scripts packed by Dean Edward’s popular packer,
 as well as deobfuscate scripts processed by
 [javascriptobfuscator.com](http://javascriptobfuscator.com/).
 
-To beautify from the command-line you can use provided python script/library.
+## Usage
+
+To beautify from the command-line you can use the provided Python script/library or [npm](http://npmjs.org/) package.
+
+### Python
 
 `./js-beautify file.js` beautifies a file, output goes to `stdout`.
 
@@ -28,9 +32,75 @@ opts.indent_size = 2
 res = jsbeautifier.beautify('some javascript', opts)
 ```
 
+### JavaScript
+
+As an alternative to the Python script, you may install the NPM package `js-beautify`. When installed globally, it provides an executable `jsbeautify` script. As with the Python script, the beautified result is sent to `stdout` unless otherwise configured.
+
+```js
+jsbeautify foo.js
+```
+
+`jsbeautify -h`
+
+You can also use `js-beautify` as a `node` library:
+
+```js
+var beautify = require('js-beautify').js_beautify,
+    fs = require('fs');
+
+fs.readFile('foo.js', 'utf8', function (err, data) {
+    if (err) {
+        throw err;
+    }
+    console.log(beautify(data, { indent_size: 2 }));
+});
+```
+
+### Options
+
+These are the command-line flags for both Python and JS scripts:
+
+    CLI Options:
+      -f, --file                    Input file(s) (Pass '-' for stdin). These can also be passed directly.
+      -i, --in-place                Write output in-place (replacing input)
+      -o, --outfile                 Write output to file (default stdout)
+    
+    Beautifier Options:
+      -s, --indent-size             Indentation size [default: 4]
+      -c, --indent-char             Indentation character [default: " "]
+      -l, --indent-level            Initial indentation level [default: 0]
+      -t, --indent-with-tabs        Indent with tabs, overrides -s and -c
+      -p, --preserve-newlines       Do not preserve existing line-breaks [default: true]
+      -m, --max-preserve-newlines   Maximum number of line-breaks to be preserved in one chunk [default: 10]
+      -j, --jslint-happy            Enable jslint-stricter mode
+      -b, --brace-style             Brace style [collapse|expand|end-expand|expand-strict] [default: "collapse"]
+      -k, --keep-array-indentation  Preserve array indentation
+      -a, --indent-case             Indent case inside switch
+      -x, --unescape-strings        Decode printable characters encoded in xNN notation
+
+These correspond to underscored option keys for both library interfaces:
+
+    defaults = {
+        indent_size: 4,
+        indent_char: " ",
+        indent_level: 0,
+        indent_with_tabs: false,
+        preserve_newlines: true,
+        max_preserve_newlines: 10,
+        jslint_happy: false,
+        brace_style: "collapse",
+        keep_array_indentation: false,
+        indent_case: false,
+        unescape_strings: false
+    }
+
+## License
+
 You are free to use this in any way you want, in case you find this
 useful or working for you.
 
+## Credits
+
 Written by Einar Lielmanis, <einar@jsbeautifier.org>
 Python version flourished by Stefano Sanfilippo <a.little.coder@gmail.com>